The OpenVPN client contains a format string bug in the handling of the
foreign_option in options.c. Furthermore, when the OpenVPN server runs
in TCP mode, it may dereference a NULL pointer under specific error
conditions.

Impact
======

A remote attacker could setup a malicious OpenVPN server and trick the
user into connecting to it, potentially executing arbitrary code on the
client's computer. A remote attacker could also exploit the NULL
dereference issue by sending specific packets to an OpenVPN server
running in TCP mode, resulting in a Denial of Service condition.

Workaround
==========

Do not use "pull" or "client" options in the OpenVPN client
configuration file, and use UDP mode for the OpenVPN server.

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200511-07.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.